Combinators

I started reading Scala in Action as my first Scala book (I've come to 
realize this book is way too advanced for beginners, i am struggling 
mightily). 

I need help with the following. 

object Combinators {
  implicit def kestrel[A](a: A) = new {
    def tap(sideEffect: A => Unit): A = {
      sideEffect(a)
      a
    }
  }
}

case class Person(firstName: String, lastName: String)
case class Mailer(mailAddress: String) {
  def mail(body: String) = {
    println("send mail here...")
  }
}

object Main {
  import Combinators._
  def main(args: Array[String]): Unit = {
    Person("Nilanjan", "Raychaudhuri").tap(p => {
      println("First name " + p.firstName)
      Mailer("some address").mail("new person joined " + p)
    }).lastName
  }
}

My questions are as follows:
1) How does Person automatically get access to "tap"? 
 2) What does the implicit keyword do here? (am guessing this might answer 
q #1)
3) Any other book suggestions for a Java guy trying to learn Scala. (I've 
got about 10 years of Java experience, if that helps).

Thanks in advance. 

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