Answer:

CONTACT

Answer	Crossword Clue
CONTACT	Sagan best-seller
CONTACT	A touching moment?
CONTACT	Sagan novel

CONTACT	Go-between
CONTACT	Get in touch with
CONTACT	Sticky paper
CONTACT	Reach
CONTACT	Address book entry
CONTACT	Establish business connection with: Slang.
CONTACT	Social or business connection.
CONTACT	Ready!: Aviation signal.

CONTACT	Touch.
CONTACT	Connection.
CONTACT	Lens type
CONTACT	Kind of lens
CONTACT	Influential acquaintance
CONTACT	Connection
CONTACT	It's touching
CONTACT	Get ahold of

CONTACT	Secret agent's need
CONTACT	Help for a secret agent
CONTACT	Help for a spy
CONTACT	Electrode
CONTACT	Big news involving extraterrestrials